This web site can be helpful!

Letheen Agar Base, modified
... Letheen Agar and Letheen Broth are special formulations for the determination
of bacterial activity of quaternary ammonium compounds. ...
http://www.merck.de/english/services/chemdat/catalogs/mibio/...

Dehydrated culture media
... Agar) Fluid Casein Digest Soya Lecithin Medium HS Medium Letheen Agar and Letheen
Broth AOAC (B224) Microbial Content Test Agar (Tryptone Soya Agar w/Lecithin ...
http://www.biomarklabs.com/dehcul.html
Good luck!

Perdón mal interprete tu pregunta....... aquí están las versiones en español:

Unitrade, Hospitalaria
... 11317, Agar Kliger Hierro, 500 gramos, 11341, Agar Letheen,
500 gramos, 11359, Agar Lowestein Jensen, 500 gramos, ...
http://www.unitrademedical.com/paginas/microbiologia.htm

09-25-95 NORMA Oficial Mexicana NOM-089-SSA1-1994, Bienes y ...
... 6.3.2.1 Medios nutritivos o de enriquecimiento. 6.3.2.1.1
Agar Letheen modificado. Agar Letheen 32 ...
http://www.ssa.gob.mx/nom/089ssa14.html